Question

3 burger+7 shakes+1fries=120RS. 4burger+10 shakes+1fries=164.50RS. 1burger+1shakes+1fries=?​

Answer 1

Answer:

Let burger be x,shakes be y and fries be z

3x + 7y + z = 120.........eq 1

4x + 10y + z = 164.5.......eq2

SUBTRACTING eq 1 FROM eq 2 we get,

x + 3y = 44.5

MULTIPY THE ABOVE EQUATION BY 2

2x + 6y = 89

First eq can be written as

x + y + z + 2x + 6y = 120

substitute the values

x + y + z +89 =120

x +y + z = 31

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